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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '086dfa797e3007d3b03e5f52d4c54e103016e9087a3bb5c7b06ed8dabec1e13c' 
  AND token = 'DLEpPQWzJfQTn/tzEsjZ/Iaou4NZR6qJ3xGvyCCzK8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}